Method ExecuteDataWithInformation

IO/Image/vtkPNGReader.cxx:604–631

------------------------------------------------------------------------------ This function reads a data from a file. The datas extent/axes are assumed to be the same as the file extent/order.

// This function reads a data from a file.  The datas extent/axes
// are assumed to be the same as the file extent/order.
void vtkPNGReader::ExecuteDataWithInformation(vtkDataObject* output, vtkInformation* outInfo)
{
  vtkImageData* data = this->AllocateOutputData(output, outInfo);

  if (!this->GetStream() && !this->GetMemoryBuffer() && this->InternalFileName == nullptr)
  {
    vtkErrorMacro(<< "Either a Stream, FileName, FilePrefix or MemoryBuffer must be specified.");
    this->SetErrorCode(vtkErrorCode::NoFileNameError);
    return;
  }

  data->GetPointData()->GetScalars()->SetName("PNGImage");

  this->ComputeDataIncrements();

  // Call the correct templated function for the output
  void* outPtr;

  // Call the correct templated function for the input
  outPtr = data->GetScalarPointer();
  switch (data->GetScalarType())
  {
    vtkTemplateMacro(this->vtkPNGReaderUpdate(data, (VTK_TT*)(outPtr)));
    default:
      vtkErrorMacro(<< "UpdateFromFile: Unknown data type");
      this->SetErrorCode(vtkErrorCode::UnrecognizedFileTypeError);
  }
}

//------------------------------------------------------------------------------
int vtkPNGReader::CanReadFile(const char* fname)